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/*
 * Copyright 2003-2010 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.ast;

import java.lang.reflect.Modifier;

/**
 * Helper class for converting AST into text.
 * @author Hamlet D'Arcy
 */
public class AstToTextHelper {

    public static String getClassText(ClassNode node) {
        if (node == null) return "";
        if (node.getName() == null) return "";
        return node.getName();
    }

    public static String getParameterText(Parameter node) {
        if (node == null) return "";

        String name = node.getName() == null ? "" : node.getName();
        String type = getClassText(node.getType());
        if (node.getInitialExpression() != null) {
            return type + " " + name + " = " + node.getInitialExpression().getText();
        }
        return type + " " + name;
    }

    public static String getParametersText(Parameter[] parameters) {
        if (parameters == null) return "";
        if (parameters.length == 0) return "";
        StringBuilder result = new StringBuilder();
        int max = parameters.length;
        for (int x = 0; x < max; x++) {
            result.append(getParameterText(parameters[x]));
            if (x < (max - 1)) {
                result.append(", ");
            }
        }
        return result.toString();
    }

    public static String getThrowsClauseText(ClassNode[] exceptions) {
        if (exceptions == null) return "";
        if (exceptions.length == 0) return "";
        StringBuilder result = new StringBuilder("throws ");
        int max = exceptions.length;
        for (int x = 0; x < max; x++) {
            result.append(getClassText(exceptions[x]));
            if (x < (max - 1)) {
                result.append(", "); 
            }
        }
        return result.toString(); 
    }

    public static String getModifiersText(int modifiers) {
        StringBuilder result = new StringBuilder();
        if (Modifier.isPrivate(modifiers)) {
            result.append("private ");
        }
        if (Modifier.isProtected(modifiers)) {
            result.append("protected ");
        }
        if (Modifier.isPublic(modifiers)) {
            result.append("public ");
        }
        if (Modifier.isStatic(modifiers)) {
            result.append("static ");
        }
        if (Modifier.isAbstract(modifiers)) {
            result.append("abstract ");
        }
        if (Modifier.isFinal(modifiers)) {
            result.append("final ");
        }
        if (Modifier.isInterface(modifiers)) {
            result.append("interface ");
        }
        if (Modifier.isNative(modifiers)) {
            result.append("native ");
        }
        if (Modifier.isSynchronized(modifiers)) {
            result.append("synchronized ");
        }
        if (Modifier.isTransient(modifiers)) {
            result.append("transient ");
        }
        if (Modifier.isVolatile(modifiers)) {
            result.append("volatile ");
        }
        return result.toString().trim();
    }
}